class.ilObjSessionAccess.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilObjSessionAccess
{
        protected static $registrations = null;
        protected static $registered = null;

        public static function _getCommands()
        {
                $commands = array
                (
                        array("permission" => "read", "cmd" => "infoScreen", "lang_var" => "info_short", "default" => true),
                        array("permission" => "read", "cmd" => "register", "lang_var" => "join"),
                        array("permission" => "read", "cmd" => "unregister", "lang_var" => "event_unregister"),
                        array("permission" => "write", "cmd" => "edit", "lang_var" => "edit")
                );
                
                return $commands;
        }

        public function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
        {
                global $ilUser, $lng, $rbacsystem, $ilAccess;
                
                $a_user_id = $a_user_id ? $a_user_id : $ilUser->getId();
                switch($a_cmd)
                {
                        case 'register':
                                if(self::_lookupRegistration($a_obj_id))
                                {
                                        return !self::_lookupRegistered($a_user_id,$a_obj_id);
                                }
                                return false;
                                
                        case 'unregister':
                                if(self::_lookupRegistration($a_obj_id))
                                {
                                        return self::_lookupRegistered($a_user_id,$a_obj_id);
                                }
                                return false;
                }
                return true;
        }
        
        
        public function _checkGoto($a_target)
        {
                global $ilAccess;
                
                $t_arr = explode("_", $a_target);

                if ($t_arr[0] != "sess" || ((int) $t_arr[1]) <= 0)
                {
                        return false;
                }

                if($ilAccess->checkAccess("read", "", $t_arr[1]))
                {
                        return true;
                }
                return false;
        }
        
        public static function _lookupRegistration($a_obj_id)
        {
                if(!is_null(self::$registrations))
                {
                        return self::$registrations[$a_obj_id];
                }
                
                global $ilDB;
                
                $query = "SELECT registration,obj_id FROM event ";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        self::$registrations[$row->obj_id] = (bool) $row->registration;
                }
                return self::$registrations[$a_obj_id];
        }
        
        public static function _lookupRegistered($a_usr_id,$a_obj_id)
        {
                if(isset(self::$registered[$a_usr_id]))
                {
                        return (bool) self::$registered[$a_usr_id][$a_obj_id];
                }
                
                global $ilDB,$ilUser;
                
                $query = "SELECT event_id, registered FROM event_participants WHERE usr_id = ".$ilDB->quote($ilUser->getId());
                $res = $ilDB->query($query);
                self::$registered[$a_usr_id] = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        self::$registered[$a_usr_id][$row->event_id] = (bool) $row->registered;
                }
                return (bool) self::$registered[$a_usr_id][$a_obj_id];
        }
        
}
?>